condition for Mat step

modules/core/include/opencv2/core/mat.inl.hpp

@@ -372,7 +372,7 @@ Mat::Mat(int _rows, int _cols, int _type, void* _data, size_t _step)
       data((uchar*)_data), datastart((uchar*)_data), dataend(0), datalimit(0),
       allocator(0), u(0), size(&rows)
 {
-    size_t esz = CV_ELEM_SIZE(_type);
+    size_t esz = CV_ELEM_SIZE(_type), esz1 = CV_ELEM_SIZE1(_type);
     size_t minstep = cols * esz;
     if( _step == AUTO_STEP )
     {
@@ -383,6 +383,12 @@ Mat::Mat(int _rows, int _cols, int _type, void* _data, size_t _step)
     {
         if( rows == 1 ) _step = minstep;
         CV_DbgAssert( _step >= minstep );
+
+        if (_step % esz1 != 0)
+        {
+            CV_Error(Error::BadStep, "Step must be a multiple of esz1");
+        }
+
         flags |= _step == minstep ? CONTINUOUS_FLAG : 0;
     }
     step[0] = _step;
@@ -397,7 +403,7 @@ Mat::Mat(Size _sz, int _type, void* _data, size_t _step)
       data((uchar*)_data), datastart((uchar*)_data), dataend(0), datalimit(0),
       allocator(0), u(0), size(&rows)
 {
-    size_t esz = CV_ELEM_SIZE(_type);
+    size_t esz = CV_ELEM_SIZE(_type), esz1 = CV_ELEM_SIZE1(_type);
     size_t minstep = cols*esz;
     if( _step == AUTO_STEP )
     {
@@ -408,6 +414,12 @@ Mat::Mat(Size _sz, int _type, void* _data, size_t _step)
     {
         if( rows == 1 ) _step = minstep;
         CV_DbgAssert( _step >= minstep );
+
+        if (_step % esz1 != 0)
+        {
+            CV_Error(Error::BadStep, "Step must be a multiple of esz1");
+        }
+
         flags |= _step == minstep ? CONTINUOUS_FLAG : 0;
     }
     step[0] = _step;

modules/core/src/matrix.cpp

@@ -282,7 +282,7 @@ static inline void setSize( Mat& m, int _dims, const int* _sz,
     if( !_sz )
         return;
 
-    size_t esz = CV_ELEM_SIZE(m.flags), total = esz;
+    size_t esz = CV_ELEM_SIZE(m.flags), esz1 = CV_ELEM_SIZE1(m.flags), total = esz;
     int i;
     for( i = _dims-1; i >= 0; i-- )
     {
@@ -291,7 +291,14 @@ static inline void setSize( Mat& m, int _dims, const int* _sz,
         m.size.p[i] = s;
 
         if( _steps )
+        {
+            if (_steps[i] % esz1 != 0)
+            {
+                CV_Error(Error::BadStep, "Step must be a multiple of esz1");
+            }
+
             m.step.p[i] = i < _dims-1 ? _steps[i] : esz;
+        }
         else if( autoSteps )
         {
             m.step.p[i] = total;